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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Deferred tax assets: |  |  |
Reserves and accruals | $ 31,999 | $ 31,208 | $ 33,741
Net operating loss carryovers | 27,522 | 24,852 | 27,431
Research and development credit carryovers | 13,704 | 13,500 | 12,136
Deferred stock-based compensation | 7,684 | 6,643 | 6,063
Other tax credits | 2,207 | 2,764 | 2,813
Total deferred tax assets | 83,116 | 78,967 | 82,184
Valuation allowance | (34,347) | (28,354) | (26,557)
Net deferred tax assets | 48,769 | 50,613 | 55,627
Deferred tax liabilities: |  |  |
Depreciation and amortization | (5,485) | (5,434) | (3,320)
Intangibles | (11,656) | (17,668) | (26,172)
Other | (483) | (135) | (1,066)
Net deferred tax liabilities | $ (17,624) | $ (23,237) | $ (30,558)

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